<html> 
<head> 
<title> </title>
<style> 
px {font-family: "Lucida Console", Monaco }
p { font-size:100%; line-height:1.1em; }
body {xfont-style: sans-serif}
body {
color:#333; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:1em; line-height:1.3em; }
a:visited { color:#666; }
h1,h2,h3,h4,h5,h6 { color:#333; font-family:georgia, verdana, sans-serif; }
h1 { font-size:150%; page-break-before:auto;background-color: #aaaaff}
h2 { font-size:143%;color:teal; }
h3 { font-size:134%;color:blue; }
h4 { font-size:120%;color:gray; }
img { max-width: 55em}
p{ padding: 0;margin:0; }
p{ padding-right:1.4em; }
p{ padding-bottom:0.1em; }
p{ padding-top:1em; }
p{ whitespace: pre-wrap; }
h5,h6 { font-size:100% }
a.nav,a:link.nav, a:visited.nav { background-color:#FFF; color:#000; }
XXtable { border:double #000; border-collapse:collapse; }
XXtable { border-collapse:collapse; }
XXtd { border:thin solid #888; }
XXtd { border:none; }
li { margin-bottom:0.5em; }
blockquote { display:block; font-size:100%; line-height:1.1em; margin:0 0 0.5em; padding:0 2.5em; }
pre { background-color:#DDD; font-size:100%; overflow:auto; padding:1em; }
a,li span { color:#000; }
a:hover, a.nav:hover, a:hover math { background-color:#000; color:#FFF; }
#Container { margin:0 10px; text-align:center; background-color: #BBB}
#Content { border-top:none; margin:auto; padding:0.3em; text-align:left; width:100%; max-width:55em; background:#FFF}
span.webName { font-size:.5em; }
textarea#content { font-size: 1em; line-height: 1.125; }
h1#pageName { line-height:1em; margin:0.2em 0 0.2em 0; padding:0; }
.property { color:#666; font-size:100%; }
a.existingWikiWord[title]{ //border: 1px dashed #BBB; }
.byline { color:#666; font-size:1.0em; font-style:italic; margin-bottom:1em; padding-top:1px; } 
</style> 
</head>
<BODY bgcolor=#F0F0F0 text=#000000 link=#0000ff vlink=#C000C0 alink=#ff0000><A NAME=top></A>
<h5><a href="https://github.com/urbanjost/M_strings">[UP]</a></h5>
<div id="Container">
<div id="Content">
<CENTER>
<H1><HR><I>Manual Reference Pages &nbsp;-&nbsp;</I><NOBR>change (3m_strings)</NOBR><HR></H1>
</CENTER>
<A name=0>

     <H3>NAME</H3>

</A>
<BLOCKQUOTE>
<B>change</B>(3f) - [M_strings:EDITING] change old string to new string with
a directive like a line editor
(LICENSE:PD)
<P>
</BLOCKQUOTE>
<A name=contents></A><H3>CONTENTS</H3></A>
<BLOCKQUOTE>
<A HREF=#1>Synopsis</A><BR>
<A HREF=#2>Description</A><BR>
<A HREF=#3>Options</A><BR>
<A HREF=#4>Examples</A><BR>
<A HREF=#5>Author</A><BR>
<A HREF=#6>License</A><BR>
</BLOCKQUOTE>
<A name=7>

     <H3>SYNOPSIS</H3>

</A>
<BLOCKQUOTE>
subroutine <B>change</B>(target_string,cmd,ierr)
<P>
<PRE>
    character(len=*),intent(inout) :: target_string
    character(len=*),intent(in)    :: cmd
    integer                        :: ierr
<P>
</PRE>
</BLOCKQUOTE>
<A name=2>

     <H3>DESCRIPTION</H3>

</A>
<BLOCKQUOTE>
change an old substring into a new substring in a character variable
like a line editor. Primarily used to create interactive utilities
such as input history editors for interactive line-mode programs. The
output string is assumed long enough to accommodate the change.
a directive resembles a line editor directive of the form
<P>
<PRE>
      C/old_string/new_string/
<P>
</PRE>
where / may be any character which is not included in old_string
or new_string.
<P>
a null old_string implies "beginning of string".
</BLOCKQUOTE>
<A name=3>

     <H3>OPTIONS</H3>

</A>
<BLOCKQUOTE>
<TABLE cellpadding=3>
<TR valign=top><TD colspan=2>
<B>target_string</B> </TD></TR><TR valign=top><TD width=6%>&nbsp;</TD><TD>
line to be changed
</TD></TR>
<TR valign=top><TD width=6% nowrap>
<B>cmd</B> </TD><TD valign=bottom>
contains instructions to change the string
</TD></TR>
<TR valign=top><TD width=6% nowrap>
<B>ierr</B> </TD><TD valign=bottom>
error code.
<TABLE width=100% cellpadding=3><!-- tsb: error code.
 -->
<TR></TR><TR></TR>
<TR valign=top><TD width=3%>
o
</TD><TD>
=<B>-1</B> bad directive
</TD></TR>
<TR valign=top><TD width=3%>
o
</TD><TD>
=0 no changes made
</TD></TR>
<TR valign=top><TD width=3%>
o
</TD><TD>
&gt;0 count of changes made
</TD></TR>
<TR></TR></TABLE></TD></TR>
<TR></TR></TABLE></BLOCKQUOTE>
<A name=4>

     <H3>EXAMPLES</H3>

</A>
<BLOCKQUOTE>
Sample program:
<P>
<PRE>
   program demo_change
<P>
    use M_strings, only : change
    implicit none
    character(len=132) :: line=&#146;This is a test string to change&#146;
    integer            :: ierr
       write(*,*)trim(line)
       ! change miniscule a to uppercase A
       call change(line,&#146;c/a/A/&#146;,ierr)
       write(*,*)trim(line)
       ! put string at beginning of line
       call change(line,&#146;c//prefix: /&#146;,ierr)
       write(*,*)trim(line)
       ! remove blanks
       call change(line,&#146;c/ //&#146;,ierr)
       write(*,*)trim(line)
</PRE>
end program demo_change
<P>
Expected output
<P>
<PRE>
    This is a test string to change
    This is A test string to chAnge
    prefix: This is A test string to chAnge
    prefix:ThisisAteststringtochAnge
<P>
</PRE>
</BLOCKQUOTE>
<A name=5>

     <H3>AUTHOR</H3>

</A>
<BLOCKQUOTE>
John S. Urban
</BLOCKQUOTE>
<A name=6>

     <H3>LICENSE</H3>

</A>
<BLOCKQUOTE>
Public Domain
</BLOCKQUOTE>
<P><HR>
<TABLE width=100%><TR> <TD width=33%><I>Nemo Release 3.1</I></TD> <TD width=33% align=center>change (3m_strings)</TD> <TD align=right width=33%><I>April 30, 2022</I></TD> </TR></TABLE><FONT SIZE=-1>Generated by <A HREF="http://www.squarebox.co.uk/download/manServer.shtml">manServer 1.08</A> from 2354b436-5dfc-41cb-bb09-5664b4350ee6 using man macros.</FONT>
<br><br><center><img src="images/change.gif"></center>
</div>
</div>
</body>
</HTML>
